This study has the shortcomings of other systematic reviews including lack of access to original data such as EEG waveforms. Generalized PD with triphasic morphology. Percentage of abnormal EEGs in each category Note that the number of EEG findings may be higher than the number of patients as a given patient may have more than one finding. Table 2 EEG features classified by background abnormalities, periodic and rhythmic activity, sharp waves, seizures, and status epilepticus. In studies that utilized continuous EEG, 96.8 % (n = 243) of the 251 patients were reported to have abnormalities compared to 85.0 % (n = 311) patients who did not undergo continuous EEG monitoring (χ 2 = 22.8, p =< 0.001). Frontal EEG patterns comprised of approximately a third of all findings. (2) Periodic and rhythmic EEG patterns: generalized periodic discharges (n = 35, 5.7 %), lateralized/multifocal periodic discharges (n = 24, 3.9 %), generalized rhythmic activity (n = 32, 5.2 %). Abnormal EEG findings (n = 543, 88.0 %) were sub-classified into three groups: (1) Background abnormalities: diffuse slowing (n = 423, 68.6 %), focal slowing (n = 105, 17.0 %), and absent posterior dominant rhythm (n = 63, 10.2 %). Common EEG indications were altered mental status (61.7 %), seizure-like events (31.2 %), and cardiac arrest (3.5 %). The median age was 61.3 years (IQR 45−69, 33.3 % female).
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